US8939054B2 - Lock for a flip open knife, and mechanism for making same automatic - Google Patents
Lock for a flip open knife, and mechanism for making same automatic Download PDFInfo
- Publication number
- US8939054B2 US8939054B2 US13/597,128 US201213597128A US8939054B2 US 8939054 B2 US8939054 B2 US 8939054B2 US 201213597128 A US201213597128 A US 201213597128A US 8939054 B2 US8939054 B2 US 8939054B2
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- strap lock
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- 230000007246 mechanism Effects 0.000 title claims abstract description 17
- 230000033001 locomotion Effects 0.000 claims description 20
- 210000003813 thumb Anatomy 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 125000006850 spacer group Chemical group 0.000 description 20
- 238000010304 firing Methods 0.000 description 12
- 230000009471 action Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 210000003811 finger Anatomy 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000881 depressing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B1/00—Hand knives with adjustable blade; Pocket knives
- B26B1/02—Hand knives with adjustable blade; Pocket knives with pivoted blade
- B26B1/04—Hand knives with adjustable blade; Pocket knives with pivoted blade lockable in adjusted position
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/04—Processes
Definitions
- the present disclosure relates to folding knives, and particularly to a method of profiling the level of force deployed in opening of a flip open blade as well as an adjustable lock to compensate for wear.
- Folding knives with a lock mechanism to keep the blade open are well known.
- these knives have a spring actuated lock that rests either on the side of the blade or on the blade tang as the blade rotates. This positioning of the lock, and its constant contact with the blade or tang during rotation, causes friction so that blade rotation is constantly subject to drag. Also, when the blade has been in use, the strap lock interface and locking surfaces wear and the blade develops some slop or lock wiggle. This makes for a low quality knife and unsafe conditions.
- a very popular design for modern folding knives is a configuration that allows for the blade to be opened by exerting pressure on a spur of the tang, protruding above the handle frame. This spur is often called a “flipper”. These knives are commonly called “Flipper Knives” and most variations rely on a locking mechanism based on the liner lock.
- Liner locks are well known, and an example can be found in U.S. Pat. No. 825,093 to Watson.
- the disadvantage of using a liner lock, in conjunction with this opening method, is that the liner lock is in continuous contact with the blade tang when the knife rotates, which generates an unacceptable level of drag on the opening blade. Folding knives of this design are difficult to open and prone to misfire, requiring an enhanced level of dexterity by the operator.
- the basic configuration of the blade lock has much in common with automatic knives developed in Italy during the nineteenth century.
- the Italian design herein referred to as a strap lock, relies on a flat spring affixed to the spine of the handle frame near the butt of the handle and resiliently capturing a protrusion on the blade tang to cause lock up when opened.
- the disadvantage of the Italian design is lack of a means to compensate for strap lock wear and it's incompatibility with modern flipper opening methods, due to the fact that the flipper spur must pass through the area occupied by the strap lock.
- Embodiments herein are directed to providing a knife with a locking mechanism with an adjustable wedge to remove blade slop.
- loose tolerances can be adjusted out using the adjustment wedge, thereby avoiding the necessity for precision parts.
- Normal use of the knife can cause some wear between the stop pin and handles, as well as the lock interface, leading to some looseness of the connection of the blade and lock. This looseness, or slop, can also be removed by the adjustment wedge.
- the present mechanism allows for smooth opening and closing of the blade by limiting friction against the blade as it rotates.
- locking folding knives have some frictional forces against the blade, be it a ball detent or washers.
- embodiments herein provide a bearing system for low friction blade rotation.
- a strap lock for the blade is arranged so that the strap lock comes into contact with the blade only at the start of opening and at the end of opening. This feature further limits friction forces against the blade.
- the locking mechanism of the knife does not contact the blade during the majority of the blade's rotation from closed to opened
- a closely controlled level of resistance is provided at the beginning of the opening cycle, so that when sufficient force is supplied by a user to overcome this resistance and the resistance is overcome, the force the user is supplying to the blade is sufficient to propel the blade fully to open and lock without fail.
- an automatic opening knife that includes the double action option of opening, either manually by thumb pressure against a blade mounted stud or hole, or automatically by manipulating a firing switch.
- Embodiments utilize one or more of a safety that is integral to the firing switch, a lock that is adjustable to compensate for lock wear, a main spring that is adjustable for power output, as well as the added feature of both ambidextrous opening and ambidextrous delocking, although other features may be used.
- FIG. 1A is a front perspective view of a folding knife in accordance with embodiments, with the blade of the folding knife open.
- FIG. 1B is a front perspective view of the folding knife of FIG. 1 , with the blade closed.
- FIG. 2 is an exploded view of the knife of FIG. 1 .
- FIG. 3A is a left plan view of a knife blade for the knife of FIG. 1 .
- FIG. 3B is a detail view 3 B of FIG. 3A , showing a blade lock notch for the knife of FIG. 1 .
- FIG. 3C is a detail view 3 C of FIG. 3A , showing a blade closed detent notch for the knife of FIG. 1 .
- FIG. 4A is a left plan view of a left handle for the knife of FIG. 1 .
- FIG. 4B is a right plan view of the left handle.
- FIG. 5 is a front perspective view of the left handle inlay for the knife of FIG. 1 .
- FIG. 6A is a top view of a strap lock for the knife of FIG. 1 .
- FIG. 6B is a left view of the strap lock.
- FIG. 6C is a front perspective view of the strap lock.
- FIG. 7A is a left plan view of a spacer for the knife of FIG. 1 .
- FIG. 7B is a front perspective view of the spacer.
- FIG. 8A is a left plan view of an adjustment wedge for the knife of FIG. 1 .
- FIG. 8B is a front perspective of the adjustment wedge.
- FIG. 9A is a front perspective view of a bearing race for the knife of FIG. 1 .
- FIG. 9B is a front perspective view of a stop pin for the knife of FIG. 1 .
- FIG. 9C is a front perspective view of a pivot pin for the knife of FIG. 1 .
- FIG. 9D is a front perspective view of a bearing washer for the knife of FIG. 1 .
- FIGS. 10A-10O are a sequence view and detail views showing the blade detent and blade lock engagement of the strap lock moving from the closed to open locking position.
- FIGS. 11A-11C are views and detail views showing the adjustment wedge fully adjusted to minimize blade slop at the blade notch end.
- FIGS. 11D-11F are views and detail views showing the adjustment wedge minimally adjusted allowing more blade slop at the blade notch end.
- FIG. 12 shows an additional embodiment of a folding knife including an automatic opener, and shown in a fully assembled, closed position
- FIG. 13 shows same view as FIG. 12 with handle overlay removed.
- FIG. 14 shows same view as FIG. 12 but with top half of handle frame removed.
- FIGS. 15A-C show a thrust arm assembly for the automatic opener of the knife of FIG. 12 , with the three figures showing three different views.
- FIGS. 16A-C show two different views of a rocking sear for the automatic opener of the knife of FIG. 12 .
- FIGS. 17A and 17B show two views of a trigger slide for the knife of FIG. 12 .
- FIG. 18 shows a trigger slide for the knife of FIG. 12 , with the trigger slide in a safe position.
- FIG. 19 shows the trigger slide in shows the trigger slide of FIG. 18 with a trigger switch displaced in preparation for firing.
- FIG. 20 shows the trigger slide at the end of a firing cycle.
- FIG. 21 shows the thrust arm and rocking sear of FIGS. 15 and 16 prior to firing.
- FIG. 22 shows the thrust arm and rocking sear of FIG. 21 after firing.
- FIG. 1A-1B shows a folding knife 8 in accordance with embodiments.
- the knife 8 has left and right handles 20 a and 20 b which provide safe storage for the blade 10 when closed ( FIG. 1B ).
- the two side pieces of the knife structure are referred to herein as “handles” 20 a and 20 b , as used herein, “handle” is any structure of the knife that is designed to be held by a user, and may or may not include a handle frame or other pieces of the knife body, but typically not the blade 10 .
- the blade 10 rotates around a pivot pin 70 ( FIG. 2 ) from the storage area between the handles 20 a and 20 b ( FIG. 1B ) to an open, ready-for-use position ( FIG. 1A ).
- the blade 10 includes a tang 9 at a proximal end.
- the tang 9 of the blade 10 has a hole 12 for the pivot pin 70 .
- a radial arc is formed about the proximal end of the tang 9 .
- This arc includes a stop 13 at a lower, blade side of the tang, and a stop 14 at the opposite end of the arc, or at a top of the blade.
- the stop 13 engages a pin 80 ( FIG. 10C ) and provides a rest when the blade 10 is in the closed position and prevents over-rotation of the blade.
- the stop 14 engages the pin 80 ( FIG. 10O ) for preventing over-rotation when the blade 10 is in the open position.
- the bottom edge of the tang 9 includes a flipper 11 and a detent extension 16 .
- the detent extension 16 includes a cam surface, or ramp 18 along a proximal edge.
- a tab notch, or tab 15 is located just below the flipper 11 , and between the flipper 11 and the detent extension 16 .
- the flipper 11 is a protrusion of the tang 9 used for opening the blade.
- a ramp 17 is located on the opposite side of the tang 9 from the flipper 11 .
- a lock notch 19 is located just below the ramp 17 .
- FIG. 3B shows a detail view of the lock notch 19 which fully engages the slot 42 in the strap lock 40 when the blade is in the open position ( FIGS. 10M and 10N ).
- the lock notch 19 is part of the lock notch and ramp 17 .
- FIG. 3C is a detail view of the closed position detent extension 16 and a ramp 18 , which engage the slot 42 in the strap lock 40 when the blade is closed (e.g., FIG. 10C ), as described below.
- the strap lock 40 is provided on the back of the knife 8 .
- the proximal end (right in FIG. 6A ) of the strap lock 40 is fixed to the top of the knife by an adjustment wedge 60 and a spacer element 50 , both of which are described in more detail below.
- the strap lock 40 is flexible, yet resilient, so that a distal end (left in FIG. 6A ) can bend away from the top edge of the knife 8 .
- the strap lock 40 is formed of a flexible, yet resilient material that biases towards a straight configuration (towards the handle), yet is flexible enough to move away from the handle upon the application of sufficient force, for example by a user pulling upward.
- a relief 44 can be provided to allow more flexible bending of the strap lock 40 in the region of the relief.
- a thumb ridge 43 can be provided for a user to engage with a thumb to move the strap lock 40 upward.
- the strap lock 40 can be wider than the handle, with overlapping outer edges of the strap lock providing a gripping surface for a user to grasp the strap lock and pull upward.
- the strap lock 40 includes a slot 42 ( FIG. 6A ) for the blade flipper 11 to pass thru (see FIG. 1B ).
- FIG. 6B shows the side view of the arm and
- FIG. 6C shows a perspective view.
- the slot 42 includes a lock engagement surface 41 ( FIG. 6A ) at a distal, inner edge.
- the strap lock 40 includes a second slot 46 to receive the spacer 50 .
- a proximal side of the slot 46 includes a strap lock interface 45 along an inner, proximal edge. As described below, the strap lock interface 45 is engaged by a slanted proximal edge of the wedge 60 as the wedge is tightened down to adjust position of the strap lock 40 .
- Holes 47 are positioned on opposite sides of the slot 46 to receive fasteners 141 ( FIG. 2 ) that fasten the strap lock 40 to the spacer 50 .
- FIG. 2 shows an exploded view of the knife 8 .
- the blade 10 is fastened to the handles 20 a and 20 b between washers 100 a and 100 b and bearings 110 a and 110 b by the pivot pin 70 .
- the washers 100 a and 100 b and bearings 110 a and 110 b provide smooth travel of the blade 10 between closed and opened positions.
- the pivot pin 70 also fastens the handles 20 a and 20 b and is secured by screws 160 a and 160 b.
- FIG. 4A shows the left handle 20 a .
- a hole 21 a is provided to secure the pivot pin 70 .
- Holes 23 a are provided to secure a spacer 50 ( FIG. 2 ).
- a pocket 22 a is provided for the inlay 30 a .
- FIG. 4B shows back face of the left handle 20 a .
- a hole 24 a ( FIG. 4B ) is provided for the spacer pin 170 , and a hole 25 a is provided for the stop pin 80 .
- a recess 26 a is provided for the bearings 110 .
- the right handle 20 b is a mirror of the left handle 20 a.
- FIG. 7A shows a side view of the spacer 50
- FIG. 7B shows a perspective view.
- the spacer 50 fits between the proximal ends of the handles 20 a and 20 b , and properly spaces the handle so that the blade 10 may fit between the handles.
- the spacer 50 includes a hole 56 for the spacer pin 170 , holes 54 for the fastening screws 130 a and 130 b , holes 52 to fasten to the strap lock 40 , and an adjustment wedge interface 51 to receive the adjustment wedge 60 .
- a hole 53 is provided to secure the adjustment wedge 60 .
- Holes 55 are provided to secure a belt clip 90 .
- the handles 20 a and 20 b are fastened to the spacer 50 by screws 130 a and 130 b .
- the strap lock 40 is fastened to the spacer 50 by the screws 141 .
- the stop pin 80 is held between the handles 20 a and 20 b .
- a belt clip 90 is provided and secured by screws 150 to the spacer 50 .
- the adjustment wedge 60 is fastened to the spacer 50 by a screw 140 .
- Decorative handle inlays 30 a and 30 b are provided here also.
- FIG. 8A shows a side view of the adjustment wedge 60 .
- FIG. 8B shows a perspective view.
- the adjustment wedge includes a upright surface 62 on a distal side, and an angle surface 61 on the opposite, proximal side.
- a hole 63 extends through the adjustment wedge 60 to receive a screw 140 to secure the adjustment wedge to the spacer 50 .
- FIG. 9A is a perspective view of the bearings 110 .
- FIG. 9B shows a perspective of the stop pin 80 .
- FIG. 9C shows a perspective of the pivot pin 70 .
- FIG. 9D shows a perspective of the bearing washer 100 .
- FIG. 5 shows the handle inlay 30 a and pocket 31 a for a logo.
- FIGS. 1B and 10A show the knife 9 in the stored position.
- the blade 10 is in the closed position between the handles 20 a and 20 b .
- FIG. 10B is a section view of the blade in the closed position.
- FIG. 10C shows a detail view of the connection of the blade 10 to the strap lock 40 .
- the strap lock 40 is biased down toward the pivot 70 by the resilience and bias of the material used for the strap lock 40 .
- the detent extension 16 via the cam notch 15 , is in contact with a bottom of the strap lock 40 , and is pressed downward by the strap lock 40 .
- the tab notch 15 fits around the lock engagement surface 41 of the slot 42 on the strap lock 40 .
- the bias and resilience of the spring arm 40 pushes down on the lower, inside edge of the tab notch 15 , causing the blade 10 to be pushed more toward the closed position, preventing accidental or unintentional opening of the blade 10 .
- the blade 10 is stopped from rotating further into the handle by the stop 13 engaging the stop pin 80 .
- the user pulls back on the outer, exposed protrusion of the flipper 11 (the exposed portion of the flipper in FIG. 10C ) with the index finger while gripping the handles 20 a and 20 b with the thumb (one handle 20 b ) and the other three fingers of the hand (other handle 20 a ).
- FIG. 10D shows the section view of the blade 10 as the user starts to pulls back on the flipper 11 with the index finger, starting the opening of the blade 10 .
- FIG. 10E shows a detail view of engagement of the tab notch 15 with the strap lock 40 .
- the detent extension 16 rotates up against the strap lock 40 , bending the strap lock upwards.
- the strap lock 40 flexes upward while the leaf spring action of the material in the strap lock pushes back.
- the relief area aids in flexibility and the leaf spring effect of the strap lock. This resistance to bending is overcome by the application of sufficient pulling force on the flipper 11 by the user.
- FIG. 10F is a section view of the blade 10 opening further.
- FIG. 10G shows a detail view of the strap lock 40 in contact with the detent extension 16 .
- the ramp 18 of the detent 16 pushes against the strap lock 40 on the strap lock interface 41 , pushing up on the strap lock 40 , eventually with the ramp 18 sliding over the lock engagement surface 41 and passing thru the slot 42 , allowing free rotation of the blade 10 as the ramp no longer engages the strap lock 40 .
- FIG. 10H shows a section view of the blade 10 almost fully open.
- FIG. 10I shows a detail view of the engagement of the blade 10 and the strap lock 40 .
- the lock ramp 17 is in contact with the strap lock 40 .
- FIG. 10J shows a section view of the blade 10 opening further.
- FIG. 10K shows a detail view.
- the ramp 17 eventually engages and pushes up on the strap lock 40 . Due to the inertia of the blade (discussed earlier), this action typically occurs through momentum of the blade rotation upon release from the lock engagement surface 41 .
- the momentum of the blade is sufficient not only to rotate the blade fully open, but to provide enough force to move the strap lock 40 upward via engagement by the ramp 17 . If the momentum is not sufficient, a user may grip and further rotate the blade 10 to the fully opened position.
- a user can, with proper quick and steady application of pressure to the flipper 11 , build sufficient pressure through the flipper to rotate the blade over the ramp 18 , providing sufficient pressure and ultimately blade inertia to cause the blade to rotate freely about the pivot 70 and momentum sufficient to cause the ramp 17 to engage and push out and lock into the distal end of the strap lock 40 .
- the pressure/force buildup caused by the resistant of the ramp 18 to sliding over the lock engagement surface 41 at the beginning of the opening process causes this action to naturally occur. So unlike prior art flipper knives, this action occurs almost automatically, instead of requiring a lot of practice by a user.
- FIG. 10L shows a section view of the blade fully open.
- FIG. 10M shows a detail view of the blade 10 in contact with the strap lock 40 .
- the blade When fully opened, the blade is locked in the open position by the slot 42 in the strap lock 40 fitting around the blade lock notch 19 on the proximal end of the rear of the blade 10 .
- the blade 10 is stopped from further opening by the stop 14 engaging the stop pin 80 .
- the blade lock notch 19 is in contact with strap lock interface 41 .
- the ramp 17 is passed in to the slot 42 .
- the knife is ready for use.
- FIG. 10N shows a section view of the blade 10 fully open.
- FIG. 10O shows a detail view of engagement of the blade 10 with the strap lock 40 .
- the strap lock 40 is biased down toward the pivot 70 .
- the blade 10 rotates, either freely or by a user pulling the blade, until the ramp 17 engages the strap lock 40 , in sequence first pressing it upward and passing into the slot 42 , permitting the strap lock 40 to freely move back downward.
- the strap lock interface 41 pushes down on and fits behind the blade lock notch 19 .
- the downward force of the strap lock 40 causes the blade 10 to rotate further open and locks the stop 14 against the stop pin 80 . This prevents the blade 10 from closing and makes a tight lockup without blade slop.
- the knife is returned to the storage position is as follows: The user pushes upward on the strap lock 40 unlocking the ramp 17 on the blade 10 from the slot 42 in the strap lock 40 .
- the user may pull back on the strap lock 40 , for example by gripping either side of the strap lock at opposite sides of the thumb ridge 43 , or by pushing up on the thumb ridge 43 with a thumb.
- the user then pushes down on the top of the blade 10 , rotating the blade 10 back to the stored position.
- the flipper 11 fits into the slot 42 in the strap lock 40 and the engagement of the lock engagement surface 41 with the inside of the latch 15 holds the blade closed against the strap lock 40 .
- the knife is stored.
- FIG. 11A shows a section view of the assembly with the adjustment wedge 60 fully engaged when the adjustment screw 140 is rotated clockwise.
- FIG. 11C shows a detail view. The adjustment wedge 60 is in place so that surface 62 is in contact with spacer stop surface 51 and the angled wedge edge 61 has maximum contact with strap lock interface 45 ( FIG. 11F ).
- FIG. 11B shows the blade lock notch end 19 in full contact with the strap lock interface 41 . This forces the blade stop 14 further open against the stop pin 80 , removing blade slop.
- FIG. 11D shows a section view of the assembly with the adjustment wedge 60 fully disengaged when the adjustment screw 140 is rotated counterclockwise.
- FIG. 11F shows a detail view.
- the adjustment wedge 60 is up so that surface 62 is in contact with spacer stop surface 51 and the angled wedge edge 61 has minimal contact with the adjustment wedge interface 45 . This forces the strap lock 40 fully forward toward the pivot.
- Leaf spring screws 141 are loosened and tightened to allow the strap lock 40 to slide and secure it to the spacer 50 . With the adjustment wedge 60 in this position fully disengaged the blade has maximum slop.
- FIG. 11E shows the blade lock notch end 19 not in contact with the strap lock interface 41 . This allows blade slop between the blade stop 14 against the stop pin 80 and blade lock notch end 19 spaced away from strap lock interface 41 .
- FIG. 12 shows an additional embodiment including some of the previously described features, and additionally including an automatic opener.
- the knife of FIG. 12 includes a trigger button 254 that can be manipulated by a user to automatically open the knife.
- the trigger button is designed for two motions, one of which unlocks the automatic opener and another of which actuates the automatic opener.
- trigger button 254 is lifted by thumb pressure in direction of arrow c, FIG. 22 , the thumb may then pull trigger button 254 rearward in the direction of arrow d. This motion causes the automatic opener to fire, which rotates the blade 210 to overcome the resistance of the strap lock 40 (described above).
- the trigger mechanism includes the trigger button 254 , which is mounted on the end of a flexible trigger stem 264 ( FIG. 20 ).
- the trigger stem 264 is mounted on a trigger slide 256 and includes a, in the form of a protrusion on a bottom side.
- the trigger slide safety catch 258 is normally is positioned behind a trigger slide safety boss 260 .
- the trigger slide safety boss 260 is fixed to the handles of the knife, and does not move relative to the knife.
- the trigger slide 256 is mounted for sliding movement relative to the trigger slide safety boss 260 and the knife.
- the trigger slide safety boss 260 In the normal position, shown in FIG. 18 , the trigger slide safety boss 260 is positioned behind the trigger slide safety catch 258 , and prevents movement of the trigger slide 256 rearward. As can be seen in FIG. 19 , movement upward of the trigger button 254 (the flexibility of the flexible trigger stem 264 permits this movement) moves the trigger slide safety catch 258 upward so that it may move over the trigger slide safety boss 260 . In this position, the user may slide the trigger button 254 rearward (right in FIG. 19 ) so that the trigger slide 256 moves rearward as well.
- the automatic opener includes a rocking sear 242 mounted on a fixed rocking sear pivot point 244 .
- the fixed rocking sear pivot point 244 is attached to the knife so that the rocking sear can pivot about it, and in the embodiment shown in the drawings, includes two attachments, extending outward, so that a thrust arm 266 , described below, can move freely between the two attachments. As can be seen in FIG.
- the rocking sear is stamped to a U-shape (also so the thrust arm 266 can move through it), and includes a rocking sear roller 246 at an upper, rear portion, and a pair of rocking sear control studs 248 at a lower, front edge.
- the thrust arm 266 is rigidly connected to a thrust arm pivot plate 268 .
- the thrust arm 266 can be a laminated three-layer structure, and the pivot plate 268 can be two plates attached on the outside of the thrust arm 266 . Rivets 276 may be used to connect the layers together.
- a protrusion 271 is attached to the top of the pivot plate 268 , and a notch 272 is formed in front the protrusion.
- the pivot plate 268 is shaped as a triangle, and is mounted for pivoting movement about a thrust arm assembly pivot point 278 .
- the protrusion 271 and the thrust arm 266 are mounted on the other points of the triangle.
- a thrust arm roller 270 is positioned on a leading end of the thrust arm 266 . As can be seen in FIG. 14 , the thrust arm roller 270 seats against a back edge of the knife tang.
- a main spring 284 ( FIG. 21 ) is mounted behind the pivot plate 268 . The main spring 284 is mounted on a main spring plunger 286 ( FIG. 14 ) and biases the thrust arm roller 270 into rotation about the thrust arm assembly pivot point 278 .
- the rocking sear 242 mounts around the thrust arm 266 , so that the top arm of the rocking sear is parallel to the thrust arm in a normal position.
- the rocking sear roller 246 fits into the notch 272 , and prevents rotation of the thrust arm 266 against the bias of the main spring 284 .
- a rocking sear rebound spring 252 includes a rocking sear follower 250 mounted at an end.
- the rebound spring 252 biases the follower 250 into contact with the rocking sear control stud 248 , biasing the rocking sear roller 246 into engagement with the notch 272 . In this manner, under normal conditions, the rebound spring 252 prevents accidental engagement of the thrust arm 266 .
- the rear edge of the trigger slide 256 engages an opposite side of the rocking sear control stud 248 .
- the trigger button 254 When the trigger mechanism is in the normal position, the trigger button 254 is held in position by virtue of the resilient force applied by the flexible trigger stem 264 of trigger slide 256 being held in engagement with trigger slide safety boss 260 ( FIG. 18 ).
- the rocking sear 242 is positioned behind the trigger slide 256 (also FIG. 18 ), as described above.
- the rocking sear roller 246 is lodged in the notch ( FIG. 21 ), preventing actuation of the thrust arm 266 .
- the trigger mechanism is first unlocked (taken out of safety) and then is actuated.
- the trigger button 254 is lifted by thumb pressure in direction of arrow c, FIG. 12 .
- the trigger slide safety catch 258 is moved from behind the trigger slide safety boss 260 ( FIG. 19 ), permitting movement of the trigger slide 256 rearward.
- the thumb may then pull the trigger button 254 rearward in the direction of arrow d ( FIG. 12 ).
- rocking sear control stud 248 As the trigger slide 256 travels in the direction of arrow d, its engagement with rocking sear control stud 248 , produces a counter clockwise rotation of the rocking sear 242 , about rocking sear pivot point 244 , overcoming the resilient loading of rocking sear rebound spring 252 .
- the rocking sear roller 246 disengages the notch 272 in the thrust arm 266 , releasing the protrusion 271 and allowing the thrust arm 266 to rotate in a counterclockwise direction, in response to the release of energy stored in mainspring 284 .
- the thrust arm roller 270 bears against the tang of the blade 210 , which propels blade 210 to rotate about pivot point 216 , to assume the open position as previously described.
- the mainspring 284 is of a spring tension that is sufficient to move the blade 210 past the strap lock. As described previously, such force is sufficient to freely rotate the blade to a fully opened, locked position.
- Closing the blade 210 is as previously described. First the blade 210 is unlocked from the strap lock, and then the blade is rotated to a closed position. As the blade 210 is folded into handle frames 212 , the tang of the blade 210 contacts the roller 270 of the thrust arm 266 , returning thrust arm 266 to its cocked position against the pressure of main spring 284 , allowing rocking sear 242 to reengage thrust arm sear notch 272 which is the beginning of the cycle prior to the next firing
- the configuration of the strap lock allows for a predetermined level of force to be restrained prior to firing which insures a successful opening cycle to lock.
- the strap lock being subject to the gripping force of the operator's hand, when used in the open blade position, contributes to the security of a locked open blade.
- the symmetrical configuration of the strap lock provides for completely ambidextrous delocking.
- the main spring 284 of the automatic opener can be adjustable for various power levels and the blade may be opened either manually or automatically by a trigger button with integral safety.
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Abstract
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Claims (29)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/597,128 US8939054B2 (en) | 2011-08-29 | 2012-08-28 | Lock for a flip open knife, and mechanism for making same automatic |
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US201161575802P | 2011-08-29 | 2011-08-29 | |
US201261585928P | 2012-01-12 | 2012-01-12 | |
US13/597,128 US8939054B2 (en) | 2011-08-29 | 2012-08-28 | Lock for a flip open knife, and mechanism for making same automatic |
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US20130047439A1 US20130047439A1 (en) | 2013-02-28 |
US8939054B2 true US8939054B2 (en) | 2015-01-27 |
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US13/597,128 Active 2033-07-18 US8939054B2 (en) | 2011-08-29 | 2012-08-28 | Lock for a flip open knife, and mechanism for making same automatic |
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Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140020252A1 (en) * | 2012-07-17 | 2014-01-23 | Shun-fu Chen | Folding knife with locking mechanism |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5111581A (en) * | 1991-11-06 | 1992-05-12 | Collins Walter W | Bolt operated locking mechanism for folding knife |
US5325588A (en) * | 1993-05-04 | 1994-07-05 | Rogers Carl E | Knife with multiple cutting positions |
US5769094A (en) * | 1996-12-27 | 1998-06-23 | Jenkins, Jr.; R. B. | Folding knife with blade carrier |
US6463663B1 (en) * | 1999-09-24 | 2002-10-15 | Kanzawa Seiko Co., Ltd. | Folding saw |
US20030009886A1 (en) * | 2001-07-12 | 2003-01-16 | Onion Kenneth J. | Folding knife with safety lock |
US20040261272A1 (en) * | 2003-06-30 | 2004-12-30 | Rocky Moser | Folding tool |
US6836967B1 (en) * | 2003-12-30 | 2005-01-04 | Gerber Sakai Co., Ltd. | Folding knife with locking mechanism |
US6941661B2 (en) * | 2001-08-08 | 2005-09-13 | Spencer Frazer | Folding knife |
US20050241154A1 (en) * | 2003-06-04 | 2005-11-03 | Lake Ronald W | Folding knife having a locking mechanism |
US6968622B2 (en) * | 2003-05-13 | 2005-11-29 | Great Neck Saw Manufacturers, Inc. | Utility knife |
US7080457B2 (en) * | 2002-06-10 | 2006-07-25 | Scott Sullivan | Spring assisted folding knife |
US7284329B1 (en) * | 2004-12-16 | 2007-10-23 | Randall King Knives, Inc. | Folding knife with cantilevered retainer |
US7395599B2 (en) * | 2003-11-18 | 2008-07-08 | Kai U.S.A., Ltd. | Blade-assisting mechanism for a folding knife |
US20080307656A1 (en) * | 2007-06-15 | 2008-12-18 | Paul Lin | Flick knife with a lever frame |
US7578064B2 (en) * | 2002-05-31 | 2009-08-25 | Busse Jerry P | Folding knife with locking blade |
US20130133205A1 (en) * | 2011-11-29 | 2013-05-30 | Yen-Fen Lo | Assisted opening folding knife with sliding key |
-
2012
- 2012-08-28 US US13/597,128 patent/US8939054B2/en active Active
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5111581A (en) * | 1991-11-06 | 1992-05-12 | Collins Walter W | Bolt operated locking mechanism for folding knife |
US5325588A (en) * | 1993-05-04 | 1994-07-05 | Rogers Carl E | Knife with multiple cutting positions |
US5769094A (en) * | 1996-12-27 | 1998-06-23 | Jenkins, Jr.; R. B. | Folding knife with blade carrier |
US6463663B1 (en) * | 1999-09-24 | 2002-10-15 | Kanzawa Seiko Co., Ltd. | Folding saw |
US20030009886A1 (en) * | 2001-07-12 | 2003-01-16 | Onion Kenneth J. | Folding knife with safety lock |
US6941661B2 (en) * | 2001-08-08 | 2005-09-13 | Spencer Frazer | Folding knife |
US7578064B2 (en) * | 2002-05-31 | 2009-08-25 | Busse Jerry P | Folding knife with locking blade |
US7080457B2 (en) * | 2002-06-10 | 2006-07-25 | Scott Sullivan | Spring assisted folding knife |
US6968622B2 (en) * | 2003-05-13 | 2005-11-29 | Great Neck Saw Manufacturers, Inc. | Utility knife |
US20050241154A1 (en) * | 2003-06-04 | 2005-11-03 | Lake Ronald W | Folding knife having a locking mechanism |
US20040261272A1 (en) * | 2003-06-30 | 2004-12-30 | Rocky Moser | Folding tool |
US7395599B2 (en) * | 2003-11-18 | 2008-07-08 | Kai U.S.A., Ltd. | Blade-assisting mechanism for a folding knife |
US6836967B1 (en) * | 2003-12-30 | 2005-01-04 | Gerber Sakai Co., Ltd. | Folding knife with locking mechanism |
US7284329B1 (en) * | 2004-12-16 | 2007-10-23 | Randall King Knives, Inc. | Folding knife with cantilevered retainer |
US20080307656A1 (en) * | 2007-06-15 | 2008-12-18 | Paul Lin | Flick knife with a lever frame |
US20130133205A1 (en) * | 2011-11-29 | 2013-05-30 | Yen-Fen Lo | Assisted opening folding knife with sliding key |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9126343B2 (en) * | 2012-07-17 | 2015-09-08 | Shun-fu Chen | Folding knife with locking mechanism |
US20140020252A1 (en) * | 2012-07-17 | 2014-01-23 | Shun-fu Chen | Folding knife with locking mechanism |
US9498889B1 (en) * | 2015-04-15 | 2016-11-22 | Hawk Designs Inc | Double action, out the front, automatic knife |
US9764485B1 (en) * | 2015-04-15 | 2017-09-19 | Hawk Designs Inc | Out the front, automatic knife |
USD768454S1 (en) * | 2015-06-25 | 2016-10-11 | Battenfeld Technologies, Inc. | Knife |
USD768455S1 (en) * | 2015-06-25 | 2016-10-11 | Battenfeld Technologies, Inc. | Knife |
US10391645B2 (en) * | 2015-11-25 | 2019-08-27 | Southern Grind, Inc. | Multi-track bearing folding knife |
US20170144316A1 (en) * | 2015-11-25 | 2017-05-25 | Southern Grind, Inc. | Multi-Track Bearing Folding Knife |
US20170165849A1 (en) * | 2015-12-10 | 2017-06-15 | Milwaukee Electric Tool Corporation | Knife |
US11548174B2 (en) | 2015-12-10 | 2023-01-10 | Milwaukee Electric Tool Corporation | Knife |
USD789763S1 (en) | 2015-12-10 | 2017-06-20 | Milwaukee Electric Tool Corporation | Folding knife |
US12023819B2 (en) | 2015-12-10 | 2024-07-02 | Milwaukee Electric Tool Corporation | Knife |
US11052549B2 (en) * | 2015-12-10 | 2021-07-06 | Milwaukee Electric Tool Corporation | Knife |
USD790945S1 (en) | 2016-01-13 | 2017-07-04 | Milwaukee Electric Tool Corporation | Folding knife |
USD795039S1 (en) | 2016-01-13 | 2017-08-22 | Milwaukee Electric Tool Corporation | Folding knife |
US10307916B2 (en) * | 2016-01-18 | 2019-06-04 | Richard D. Hinderer | Interchangeable backspacer assembly for a knife |
US20170203447A1 (en) * | 2016-01-18 | 2017-07-20 | Richard D. Hinderer | Interchangeable Backspacer Assembly for a Knife |
USD821173S1 (en) * | 2016-01-29 | 2018-06-26 | Apex Brands, Inc. | Folding knife |
USD879578S1 (en) * | 2016-01-29 | 2020-03-31 | Apex Brands, Inc. | Folding knife |
US20170232621A1 (en) * | 2016-02-15 | 2017-08-17 | Sam Sung | Folding knife with controllable folding and unfolding mechanism |
USD834392S1 (en) | 2017-04-26 | 2018-11-27 | Apex Brands, Inc. | Utility knife |
US10532471B2 (en) * | 2018-01-18 | 2020-01-14 | Yen-Fen Lo | Folding knife configured for safe and rapid disassembly and reassembly |
US20190217488A1 (en) * | 2018-01-18 | 2019-07-18 | Yen-Fen Lo | Folding knife configured for safe and rapid disassembly and reassembly |
US10820628B2 (en) * | 2018-06-18 | 2020-11-03 | Benchmade Knife Co., Inc. | Cigar cutter |
US10953556B2 (en) | 2018-08-10 | 2021-03-23 | William R. Tuch | Switchblades |
US11141870B1 (en) * | 2019-06-22 | 2021-10-12 | Avraham Goldstein | Clips for multi-purpose tools |
USD898542S1 (en) * | 2019-07-24 | 2020-10-13 | Microtech Knives, Inc. | Serrated blade |
USD1012662S1 (en) * | 2022-05-13 | 2024-01-30 | Microtech Knives, Inc. | Blade |
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